Is the Tune Boy a good way to go? (sells on newbonneville web site for the R3). Is the K&N airfilter worth getting? Only upgrade I have is the cat bypass pipe which was done at the dealer and tuned to I believe. Was On it when I bought my 06' R3 new. Don't want to chage the stock pipes. Are there any other ways to get max performance? I still get that backfire once in a awhile at slow constant speeds. Think the colder weather has something to do with it.